src/events/SDL_events.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 31 Mar 2013 12:48:50 -0400
changeset 7037 3fedf1f25b94
parent 6977 b73d51026c68
child 7077 f8e3dcefed59
child 8461 ca8dad9be3d4
permissions -rw-r--r--
Make SDL_SetError and friends unconditionally return -1.

This lets us change things like this...

if (Failed) {
SDL_SetError("We failed");
return -1;
}

...into this...

if (Failed) {
return SDL_SetError("We failed");
}


Fixes Bugzilla #1778.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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/* General event handling code for SDL */
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#include "SDL.h"
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#include "SDL_events.h"
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#include "SDL_syswm.h"
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#include "SDL_thread.h"
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#include "SDL_events_c.h"
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#include "../timer/SDL_timer_c.h"
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#if !SDL_JOYSTICK_DISABLED
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#include "../joystick/SDL_joystick_c.h"
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#endif
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#include "../video/SDL_sysvideo.h"
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/* Public data -- the event filter */
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SDL_EventFilter SDL_EventOK = NULL;
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void *SDL_EventOKParam;
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typedef struct SDL_EventWatcher {
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    SDL_EventFilter callback;
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    void *userdata;
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    struct SDL_EventWatcher *next;
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} SDL_EventWatcher;
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static SDL_EventWatcher *SDL_event_watchers = NULL;
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typedef struct {
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    Uint32 bits[8];
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} SDL_DisabledEventBlock;
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static SDL_DisabledEventBlock *SDL_disabled_events[256];
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static Uint32 SDL_userevents = SDL_USEREVENT;
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/* Private data -- event queue */
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#define MAXEVENTS	128
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static struct
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{
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    SDL_mutex *lock;
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    int active;
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    int head;
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    int tail;
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    SDL_Event event[MAXEVENTS];
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    int wmmsg_next;
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    struct SDL_SysWMmsg wmmsg[MAXEVENTS];
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} SDL_EventQ = { NULL, 1 };
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static __inline__ SDL_bool
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SDL_ShouldPollJoystick()
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{
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#if !SDL_JOYSTICK_DISABLED
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    if ((!SDL_disabled_events[SDL_JOYAXISMOTION >> 8] ||
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         SDL_JoystickEventState(SDL_QUERY)) &&
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        SDL_PrivateJoystickNeedsPolling()) {
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        return SDL_TRUE;
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    }
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#endif
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    return SDL_FALSE;
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}
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/* Public functions */
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void
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SDL_StopEventLoop(void)
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{
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    int i;
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    SDL_EventQ.active = 0;
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    if (SDL_EventQ.lock) {
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        SDL_DestroyMutex(SDL_EventQ.lock);
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        SDL_EventQ.lock = NULL;
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    }
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    /* Clean out EventQ */
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    SDL_EventQ.head = 0;
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    SDL_EventQ.tail = 0;
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    SDL_EventQ.wmmsg_next = 0;
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    /* Clear disabled event state */
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    for (i = 0; i < SDL_arraysize(SDL_disabled_events); ++i) {
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        if (SDL_disabled_events[i]) {
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            SDL_free(SDL_disabled_events[i]);
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            SDL_disabled_events[i] = NULL;
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        }
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    }
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    while (SDL_event_watchers) {
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        SDL_EventWatcher *tmp = SDL_event_watchers;
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        SDL_event_watchers = tmp->next;
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        SDL_free(tmp);
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    }
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}
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/* This function (and associated calls) may be called more than once */
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int
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SDL_StartEventLoop(void)
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{
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    /* We'll leave the event queue alone, since we might have gotten
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       some important events at launch (like SDL_DROPFILE)
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       FIXME: Does this introduce any other bugs with events at startup?
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     */
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    /* No filter to start with, process most event types */
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    SDL_EventOK = NULL;
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    SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
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    SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
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    SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
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    /* Create the lock and set ourselves active */
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#if !SDL_THREADS_DISABLED
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    if (!SDL_EventQ.lock) {
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        SDL_EventQ.lock = SDL_CreateMutex();
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    }
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    if (SDL_EventQ.lock == NULL) {
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        return (-1);
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    }
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#endif /* !SDL_THREADS_DISABLED */
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    SDL_EventQ.active = 1;
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    return (0);
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}
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/* Add an event to the event queue -- called with the queue locked */
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static int
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SDL_AddEvent(SDL_Event * event)
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{
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    int tail, added;
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    tail = (SDL_EventQ.tail + 1) % MAXEVENTS;
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    if (tail == SDL_EventQ.head) {
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        /* Overflow, drop event */
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        added = 0;
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    } else {
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        SDL_EventQ.event[SDL_EventQ.tail] = *event;
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        if (event->type == SDL_SYSWMEVENT) {
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            /* Note that it's possible to lose an event */
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            int next = SDL_EventQ.wmmsg_next;
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            SDL_EventQ.wmmsg[next] = *event->syswm.msg;
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            SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
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                &SDL_EventQ.wmmsg[next];
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            SDL_EventQ.wmmsg_next = (next + 1) % MAXEVENTS;
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        }
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        SDL_EventQ.tail = tail;
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        added = 1;
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    }
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    return (added);
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}
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/* Cut an event, and return the next valid spot, or the tail */
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/*                           -- called with the queue locked */
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static int
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SDL_CutEvent(int spot)
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{
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    if (spot == SDL_EventQ.head) {
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        SDL_EventQ.head = (SDL_EventQ.head + 1) % MAXEVENTS;
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        return (SDL_EventQ.head);
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    } else if ((spot + 1) % MAXEVENTS == SDL_EventQ.tail) {
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        SDL_EventQ.tail = spot;
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        return (SDL_EventQ.tail);
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    } else
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        /* We cut the middle -- shift everything over */
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    {
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        int here, next;
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        /* This can probably be optimized with SDL_memcpy() -- careful! */
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        if (--SDL_EventQ.tail < 0) {
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            SDL_EventQ.tail = MAXEVENTS - 1;
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        }
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        for (here = spot; here != SDL_EventQ.tail; here = next) {
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            next = (here + 1) % MAXEVENTS;
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            SDL_EventQ.event[here] = SDL_EventQ.event[next];
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        }
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        return (spot);
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    }
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    /* NOTREACHED */
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}
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/* Lock the event queue, take a peep at it, and unlock it */
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int
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SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
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               Uint32 minType, Uint32 maxType)
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{
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    int i, used;
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    /* Don't look after we've quit */
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    if (!SDL_EventQ.active) {
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        return (-1);
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    }
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    /* Lock the event queue */
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    used = 0;
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    if (!SDL_EventQ.lock || SDL_LockMutex(SDL_EventQ.lock) == 0) {
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        if (action == SDL_ADDEVENT) {
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            for (i = 0; i < numevents; ++i) {
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                used += SDL_AddEvent(&events[i]);
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            }
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        } else {
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            SDL_Event tmpevent;
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            int spot;
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            /* If 'events' is NULL, just see if they exist */
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            if (events == NULL) {
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                action = SDL_PEEKEVENT;
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                numevents = 1;
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                events = &tmpevent;
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            }
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            spot = SDL_EventQ.head;
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            while ((used < numevents) && (spot != SDL_EventQ.tail)) {
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                Uint32 type = SDL_EventQ.event[spot].type;
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                if (minType <= type && type <= maxType) {
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                    events[used++] = SDL_EventQ.event[spot];
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                    if (action == SDL_GETEVENT) {
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                        spot = SDL_CutEvent(spot);
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                    } else {
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                        spot = (spot + 1) % MAXEVENTS;
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                    }
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                } else {
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                    spot = (spot + 1) % MAXEVENTS;
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                }
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            }
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        }
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        SDL_UnlockMutex(SDL_EventQ.lock);
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    } else {
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        return SDL_SetError("Couldn't lock event queue");
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    }
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    return (used);
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}
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SDL_bool
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SDL_HasEvent(Uint32 type)
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{
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    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, type, type) > 0);
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}
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SDL_bool
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SDL_HasEvents(Uint32 minType, Uint32 maxType)
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{
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    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, minType, maxType) > 0);
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}
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void
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SDL_FlushEvent(Uint32 type)
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{
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    SDL_FlushEvents(type, type);
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}
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void
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SDL_FlushEvents(Uint32 minType, Uint32 maxType)
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{
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    /* Don't look after we've quit */
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    if (!SDL_EventQ.active) {
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        return;
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    }
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    /* Make sure the events are current */
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#if 0
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    /* Actually, we can't do this since we might be flushing while processing
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       a resize event, and calling this might trigger further resize events.
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    */
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    SDL_PumpEvents();
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#endif
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    /* Lock the event queue */
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    if (SDL_LockMutex(SDL_EventQ.lock) == 0) {
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        int spot = SDL_EventQ.head;
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        while (spot != SDL_EventQ.tail) {
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            Uint32 type = SDL_EventQ.event[spot].type;
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            if (minType <= type && type <= maxType) {
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                spot = SDL_CutEvent(spot);
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            } else {
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                spot = (spot + 1) % MAXEVENTS;
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            }
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        }
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        SDL_UnlockMutex(SDL_EventQ.lock);
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    }
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}
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/* Run the system dependent event loops */
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void
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SDL_PumpEvents(void)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    /* Get events from the video subsystem */
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    if (_this) {
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        _this->PumpEvents(_this);
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    }
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#if !SDL_JOYSTICK_DISABLED
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    /* Check for joystick state change */
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    if (SDL_ShouldPollJoystick()) {
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        SDL_JoystickUpdate();
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    }
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#endif
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   317
}
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   318
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   319
/* Public functions */
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   320
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   321
int
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SDL_PollEvent(SDL_Event * event)
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   323
{
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   324
    return SDL_WaitEventTimeout(event, 0);
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   325
}
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   326
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   327
int
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SDL_WaitEvent(SDL_Event * event)
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   329
{
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   330
    return SDL_WaitEventTimeout(event, -1);
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}
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   333
int
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SDL_WaitEventTimeout(SDL_Event * event, int timeout)
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{
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   336
    Uint32 expiration = 0;
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   337
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   338
    if (timeout > 0)
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   339
        expiration = SDL_GetTicks() + timeout;
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   340
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   341
    for (;;) {
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   342
        SDL_PumpEvents();
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   343
        switch (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT)) {
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   344
        case -1:
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   345
            return 0;
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   346
        case 1:
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   347
            return 1;
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   348
        case 0:
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   349
            if (timeout == 0) {
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   350
                /* Polling and no events, just return */
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   351
                return 0;
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   352
            }
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   353
            if (timeout > 0 && ((int) (SDL_GetTicks() - expiration) >= 0)) {
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   354
                /* Timeout expired and no events */
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   355
                return 0;
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   356
            }
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   357
            SDL_Delay(10);
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   358
            break;
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   359
        }
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   360
    }
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   361
}
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   362
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   363
int
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   364
SDL_PushEvent(SDL_Event * event)
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   365
{
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   366
    SDL_EventWatcher *curr;
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   367
    event->generic.timestamp = SDL_GetTicks();
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   368
    if (SDL_EventOK && !SDL_EventOK(SDL_EventOKParam, event)) {
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   369
        return 0;
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   370
    }
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   371
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   372
    for (curr = SDL_event_watchers; curr; curr = curr->next) {
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   373
        curr->callback(curr->userdata, event);
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   374
    }
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   375
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   376
    if (SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0, 0) <= 0) {
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   377
        return -1;
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   378
    }
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   379
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   380
    SDL_GestureProcessEvent(event);
jim@4657
   381
slouken@1895
   382
    return 1;
slouken@0
   383
}
slouken@0
   384
slouken@1895
   385
void
slouken@1895
   386
SDL_SetEventFilter(SDL_EventFilter filter, void *userdata)
slouken@0
   387
{
slouken@1895
   388
    SDL_Event bitbucket;
slouken@0
   389
slouken@1895
   390
    /* Set filter and discard pending events */
slouken@1895
   391
    SDL_EventOK = filter;
slouken@1895
   392
    SDL_EventOKParam = userdata;
slouken@1895
   393
    while (SDL_PollEvent(&bitbucket) > 0);
slouken@0
   394
}
slouken@0
   395
slouken@1895
   396
SDL_bool
slouken@1895
   397
SDL_GetEventFilter(SDL_EventFilter * filter, void **userdata)
slouken@0
   398
{
slouken@1895
   399
    if (filter) {
slouken@1895
   400
        *filter = SDL_EventOK;
slouken@1895
   401
    }
slouken@1895
   402
    if (userdata) {
slouken@1895
   403
        *userdata = SDL_EventOKParam;
slouken@1895
   404
    }
slouken@1895
   405
    return SDL_EventOK ? SDL_TRUE : SDL_FALSE;
slouken@0
   406
}
slouken@0
   407
slouken@5146
   408
/* FIXME: This is not thread-safe yet */
slouken@5146
   409
void
slouken@5146
   410
SDL_AddEventWatch(SDL_EventFilter filter, void *userdata)
slouken@5146
   411
{
slouken@5146
   412
    SDL_EventWatcher *watcher;
slouken@5146
   413
slouken@5146
   414
    watcher = (SDL_EventWatcher *)SDL_malloc(sizeof(*watcher));
slouken@5146
   415
    if (!watcher) {
slouken@5146
   416
        /* Uh oh... */
slouken@5146
   417
        return;
slouken@5146
   418
    }
slouken@5146
   419
    watcher->callback = filter;
slouken@5146
   420
    watcher->userdata = userdata;
slouken@5146
   421
    watcher->next = SDL_event_watchers;
slouken@5146
   422
    SDL_event_watchers = watcher;
slouken@5146
   423
}
slouken@5146
   424
slouken@5146
   425
/* FIXME: This is not thread-safe yet */
slouken@5146
   426
void
slouken@5146
   427
SDL_DelEventWatch(SDL_EventFilter filter, void *userdata)
slouken@5146
   428
{
slouken@5146
   429
    SDL_EventWatcher *prev = NULL;
slouken@5146
   430
    SDL_EventWatcher *curr;
slouken@5146
   431
slouken@5146
   432
    for (curr = SDL_event_watchers; curr; prev = curr, curr = curr->next) {
slouken@5146
   433
        if (curr->callback == filter && curr->userdata == userdata) {
slouken@5146
   434
            if (prev) {
slouken@5146
   435
                prev->next = curr->next;
slouken@5146
   436
            } else {
slouken@5146
   437
                SDL_event_watchers = curr->next;
slouken@5146
   438
            }
slouken@5146
   439
            SDL_free(curr);
slouken@5146
   440
            break;
slouken@5146
   441
        }
slouken@5146
   442
    }
slouken@5146
   443
}
slouken@5146
   444
slouken@1895
   445
void
slouken@1895
   446
SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
slouken@0
   447
{
slouken@6977
   448
    if (SDL_LockMutex(SDL_EventQ.lock) == 0) {
slouken@1895
   449
        int spot;
slouken@0
   450
slouken@1895
   451
        spot = SDL_EventQ.head;
slouken@1895
   452
        while (spot != SDL_EventQ.tail) {
slouken@1895
   453
            if (filter(userdata, &SDL_EventQ.event[spot])) {
slouken@1895
   454
                spot = (spot + 1) % MAXEVENTS;
slouken@1895
   455
            } else {
slouken@1895
   456
                spot = SDL_CutEvent(spot);
slouken@1895
   457
            }
slouken@1895
   458
        }
slouken@1895
   459
    }
slouken@6977
   460
    SDL_UnlockMutex(SDL_EventQ.lock);
slouken@1895
   461
}
slouken@0
   462
slouken@1895
   463
Uint8
slouken@4429
   464
SDL_EventState(Uint32 type, int state)
slouken@1895
   465
{
slouken@1895
   466
    Uint8 current_state;
slouken@4429
   467
    Uint8 hi = ((type >> 8) & 0xff);
slouken@4429
   468
    Uint8 lo = (type & 0xff);
slouken@1895
   469
slouken@4429
   470
    if (SDL_disabled_events[hi] &&
slouken@4429
   471
        (SDL_disabled_events[hi]->bits[lo/32] & (1 << (lo&31)))) {
slouken@4429
   472
        current_state = SDL_DISABLE;
slouken@4429
   473
    } else {
slouken@4429
   474
        current_state = SDL_ENABLE;
slouken@1895
   475
    }
slouken@1895
   476
slouken@4429
   477
    if (state != current_state)
slouken@4429
   478
    {
slouken@4429
   479
        switch (state) {
slouken@4429
   480
        case SDL_DISABLE:
slouken@4429
   481
            /* Disable this event type and discard pending events */
slouken@4429
   482
            if (!SDL_disabled_events[hi]) {
slouken@4429
   483
                SDL_disabled_events[hi] = (SDL_DisabledEventBlock*) SDL_calloc(1, sizeof(SDL_DisabledEventBlock));
slouken@4429
   484
                if (!SDL_disabled_events[hi]) {
slouken@4429
   485
                    /* Out of memory, nothing we can do... */
slouken@4429
   486
                    break;
slouken@4429
   487
                }
slouken@4429
   488
            }
slouken@4429
   489
            SDL_disabled_events[hi]->bits[lo/32] |= (1 << (lo&31));
slouken@4429
   490
            SDL_FlushEvent(type);
slouken@4429
   491
            break;
slouken@4429
   492
        case SDL_ENABLE:
slouken@4429
   493
            SDL_disabled_events[hi]->bits[lo/32] &= ~(1 << (lo&31));
slouken@4429
   494
            break;
slouken@4429
   495
        default:
slouken@4429
   496
            /* Querying state... */
slouken@4429
   497
            break;
slouken@1895
   498
        }
slouken@1895
   499
    }
slouken@4429
   500
slouken@4429
   501
    return current_state;
slouken@4429
   502
}
slouken@4429
   503
slouken@4429
   504
Uint32
slouken@4429
   505
SDL_RegisterEvents(int numevents)
slouken@4429
   506
{
slouken@4429
   507
    Uint32 event_base;
slouken@4429
   508
slouken@4429
   509
    if (SDL_userevents+numevents <= SDL_LASTEVENT) {
slouken@4429
   510
        event_base = SDL_userevents;
slouken@4429
   511
        SDL_userevents += numevents;
slouken@4429
   512
    } else {
slouken@4429
   513
        event_base = (Uint32)-1;
slouken@4429
   514
    }
slouken@4429
   515
    return event_base;
slouken@0
   516
}
slouken@0
   517
slouken@0
   518
/* This is a generic event handler.
slouken@0
   519
 */
slouken@1895
   520
int
slouken@1895
   521
SDL_SendSysWMEvent(SDL_SysWMmsg * message)
slouken@0
   522
{
slouken@1895
   523
    int posted;
slouken@0
   524
slouken@1895
   525
    posted = 0;
slouken@4429
   526
    if (SDL_GetEventState(SDL_SYSWMEVENT) == SDL_ENABLE) {
slouken@1895
   527
        SDL_Event event;
slouken@1895
   528
        SDL_memset(&event, 0, sizeof(event));
slouken@1895
   529
        event.type = SDL_SYSWMEVENT;
slouken@1895
   530
        event.syswm.msg = message;
slouken@1895
   531
        posted = (SDL_PushEvent(&event) > 0);
slouken@1895
   532
    }
slouken@1895
   533
    /* Update internal event state */
slouken@1895
   534
    return (posted);
slouken@0
   535
}
slouken@1895
   536
slouken@1895
   537
/* vi: set ts=4 sw=4 expandtab: */